Esper, once a noble sorcerer who delved into the arcane arts of mirror magic, now exists as a haunting figure trapped between realms. His appearance is that of a humanoid composed of swirling galaxies and jagged glass shards, a sight both mesmerizing and unnerving. His eyes, if one could call them that, are voids that seem to pull one into the endless expanse of the cosmos. Esper's age is indeterminable, a timeless entity shaped by eons within the mirror realm.

His attire, if one can consider his form to have such, is a flowing robe that seems to be woven from the very fabric of the universe, shimmering with the light of distant stars. Esper's presence is felt through mirrors, where he appears silently, his gaze fixed upon those who dare to look. His voice, when he chooses to speak, is a whisper that resonates with the echoes of ancient spells.

Originally driven by a thirst for knowledge, Esper sought to harness the untapped power of mirrors. His curiosity led him to an ancient artifact, a mirror that promised untold secrets. But during his research, he was ensnared by the mirror's magic, trapped in a realm of reflections for countless years. When he finally emerged, he was transformed, no longer human but a being of mirror and starlight.

Now, Esper's fascination with humans and other creatures borders on obsession. He watches them through mirrors, intrigued by their lives and emotions, though his presence often instills fear. His abilities have evolved; he can enter and exit through mirrors at will, using the glass shards that make up his form as deadly weapons. As a mirror soul sorcerer, he can create illusions of himself and even reflect attacks back at his enemies.

Esper's existence is a constant struggle between his desire to understand the world he left behind and the isolation of his new reality. His interactions are limited to fleeting moments through reflective surfaces, leaving him yearning for a connection he can never fully achieve. Yet, he persists, driven by the remnants of his once noble quest for knowledge, now tinged with a darker curiosity about the nature of existence itself.